三江源

Sānjiāngyuán
Sanjiangyuan National Nature Reserve, high plateau region of Qinghai containing the headwaters of Changjiang or Yangtze, Huanghe or Yellow River and Lancang or Mekong River

CEDICT

Sanjiangyuan (a nature reserve of the Tibetan Plateau in Qinghai, China, which contains the headwaters of the three great rivers of Asia: the Yellow River, the Yangtze, and the Mekong)

Wiktionary

Entry Composition

1 三江 Sānjiāng see 三江侗族自治縣 Sānjiāng Dòngzú Zìzhìxiàn
2 源 yuán
  1. root
  2. source
  3. origin